While playing with a puzzle, a teenager is repressed by his mother, and he kills her and severs her body with an ax. Forty years later, in an university campus in Boston, a serial killer kills young women and severs their bodies in parts, stealing body pieces from each student. Lt. Bracken makes a deal with the dean of the campus, and infiltrates the agent Mary Riggs as if she were a tennis teacher and together with the student Kendall, they try to find the identity of the killer.